Rus (Russian Tsardom) culture proposition

Hi and thank you for making this game even more outstanding!
Russian Empire has been depicted in a lot of different historic strategies, with Cossacks and Sobors, but it's predecessor Russian Tsardom has not really been there. (Funny trivia: Russian Tsardom actually means Russian Empire, but to be acknowledged properly in Europe Peter I had to do a "rebranding"). My Idea is to add Rus to the game with it's flavor of following the trail of luxury goods deep into Siberia and selling them into Europe. Which prepared the foundation of formal inclusion of these territories into the Russian Empire later, which is logically followed by the industrial era Russians already in game.

Era: Early Modern

Culture: Russians (Early Modern) (or western term Muscovites if you wish to avoid era labels in culture name)

Affinity Trait: Merchant

Legacy Trait: Siberian riches: +1 resource generation on Luxury Resource extractors and Strategic Resource extractors. +20% Money from resources sold to other Empires.

Emblematic Unit: Streltsi: (43) (4) (4) - Gunner, Bastion. - The backbone of Russian Tsardom army, conscripted for life they received an intense training in fortifying their position on the battlfield and fighting from this fortified position.

Emblematic District: Ostrog: 

+5 Influence on territory if bordering Independent People, 

+2 Combat Strength in combat for units in or adjacent to the District, 

+15 District Fortification, 

+10 Stability, 

+5 Money per Luxury resource extractor in territory, 

+1 Traders Slot on City or Outpost, 

Acts as a Market Quarter and a Garrison for bonuses, 

Does not exploit any resources from below or adjacent tiles, 

Does not require being connected to a Main Plaza or Administrative Center, 

Can be purchased in Outposts using Influence, 

Is a Land Unit Spawn, 

Is fortified. 

- Ostrogs were the forward fortifications during russian colonization of Siberia, being centeres of foreign diplomacy and gathering of "yasak" - tribute collected with luxury resources, like Furs and Jewelry.